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Jan. 13, 1931, I C. L. FORTIER Re. 17,928

CONTROL SYSTEM FOR TEMPERATURE, 'HUMIDITY, AND THE LIKE Original Fil'ed May 23, 1924 2 ts- 196 1' ea-L- 7/ 5 c. 1.. FORTIER Re. 17,928 con-mob SYSTEM FOR TEMPERATURE; HUMIDITY, AND THE LIKE Jail. 13, 1931.

2 Sheets-Sheet 2 Original Fild May 23, 1924 r L H W\ 1 V a 3 Fl. //1 ruL 11, 9. g a. Z 2 y Reissued' Jan. 13, 1931 UNITED STATES PATENT. OFFICE CHARLES L. FORTIER, OF MILWAUKEE, WISCONSIN, ASSIGNOR TOv JOHNSON SERVICE COMPANY, OF MILWAUKEE, WISCONSIN, A

CONTROL SYSTEM FOR TEMPERATURE, HUMIDITY, AND THE LIKE CORPORATION OF WISCONSIN Original No. 1,597,349, dated August 24, 1926, Serial No. 115,449, filed May as, 1924. Applicationb tor reissue filed March 8, 1927. Serial No. 172,524.

This invention has reference to control systems of the compressed-air type, employing an elementor device responsive to atmospheric changes, here described in connection with temperature control but applicable also to the control of humidity; The purpose of v the invention to alford a simple mode and ctlicient means of controlling from a central point, and if desired, from a considerable distance, the action of thermostats or analogous responsive elements or devices in selected rooms or portions of a building, so that heat, moisture, or the like may be supplied to, varied in, or cut oii from such rooms. at .will WllllG held at normal in others, through automatic control.

A temperature of 70 degrees Fahrenheitis now generally adopted as the normal or usual daytime temperature suitable for rooms in dwellings, 'oflices, hotels, and the like, and it is customary to carry in the air pipe or conduit of pneumatic temperaturecontrol systems a pressure of pounds per square inch. These may hence be assumed in the following description as normal temperature and pressure figures, though any others desired may be adopted in practice, without in any manner afiectingthe principle and mode of operation herein set forth.

In buildings of a public or quasiublic character. as schoolhouses, large oilice uildings. hotels, etc.', it is customary to cut off 'or to lower the temperature after the occupants leave for the day, or during that portion of the day or night when a relativel low temperature is usually desired. This is done to economize fuel, and for hygienic reasons. It is of course desirable to be able to control from a central point the action of thermostat-s in'those rooms which are to be temporarily taken out of automatic control, or in which other than normal temperature is to be for a time maintained. This is accomplished through manipulation of the air pressure in the main air pipe of the control system. and consequent operation of devices which throw the'thermostatic control devices out of action, or set them for operation at other than the adopted normal temperature and later restore them to normal operation,

such manipulation being effected preferably at 'a. point near the air tank or source.

The invention is susceptible of embodiment in somewhat varied form, a. simple and preferred type being illustrated in the accompanying drawings, in which:

Figure 1 is a side elevation of apparatus embodying my invention, the air tanks be-. ing shown in greatly reduced size because of lack of space to show them in proper proportion to other parts; 7

Fig. 2 a face view of the thermostatic selector constituting one element of the apparatus and serving, under manipulation of the air pressure in the air .pipe'or conduit, to cause the heat to .bemaintamed at normal, at subnorinal, or entirely cut off, as desired;

Fig. 3 a horizontal section on the line 33 of Fig. 2, looking upward;

Fig. 4 a horizontal section on the line 4-4 of Fig. 1, looking downward;

Figs. 5 and 6, detail views of the stop and indicator for holding one thermostatic bar out of action.

The present invention is designed to permit the apparatus to be quickly set to-cause the instruments in different rooms, to bring about therein the temperature desired, either affected orunafi'ected by the control valve at the central station or point of control. This may be done by the anitor of the building or by occupants of the rooms. Ordinarily, however, it will. be done by the janitor or person in charge of the heating of the building, such setting being independent of the usual setting of the thermostats for a desired temperature. I In the drawings, A indicatesa thermostatic selector; B a relay; C an indicator for showing at the central control point the adjustment of the selector; D and E air'tanks; F a reducing valve; G the main air pipe; and

H the three-way valve and vent by which the pressure in the pipe G is lowered and restored to normal at wil 1 In practice, it is preferred to use two air tanks, as D and E,-the first (D) connected with a pump which forces air into said tank until a predetermined pressure, usually 30 pounds, is established therein. The second tank E is connected with the first bya pipe or cross connection containing a reducing 'valve F by which the pressure in the tank E is maintained at a lower pressure, usually 15 pounds, which is the normal pressure'deemed desirable for the main air pipe extending to the various instruments in the system or to the branches connected therewith. Upon a lowering-of the pressure in tank D the air pump automatically goes into action so that a constant pressure of 30 pounds is maintained therein, and a proper supply is always available for tank E.

It is of course to be understood that any desired number of selectors and relays may be employed in the building, all connected by sugable branch pipes with the main air The selector A, designed to cause a night and day or only a day temperature to be given the room or space under its control, comprises a main frame or base 1 having at its upper end projecting lugs 2, and at its lower end similar projecting arms 3, 4, and 5, and near its upper end a projecting nozzle or nipple 6 provided with a vent or leak-port 7 opening at its outer end. Facing the leak 'port 7 is a valve or pad 8 carried by a pendulous arm or lid 9 secured to or formed with an unbalanced or weighted block 10 carried by a p1vot-p1n 11 passing through the block 10 and held at its ends in the lugs 2, 2. The

pivot 11 is located near the outer end of block 10 so that its inner end acts as a weight tending to tip the block onits pivot, and throw the pad-carrying arm 9 outward away from the nipple 6 and its leak-port 7, and thus to open said'port.

Attached to separate saddles 12 pivotally mounted between lugs 3 and 4 and 4 and'5, are two thermostatic strips 13 and 14, each composed preferably of a strip of iron or steel and a strip of brass, soldered, sweated, I

riveted or otherwise united face to face, the strip having the higher co-eflicient oi expansion constituting the outer face in both instances. It is of course understood that any two suitable substances having different coefl icients of expansion may be thus combined with a View tosecuring a warping or flexure ofthe thermostatic strip in response to rise of fall of temperature in the surrounding med1um,'various such couples being wellknown and common in the art. The upper extremities of the strips 13 and 14 both overlie or stand infront of the pendulous pad-carrying arm 9, so that either strip onbending or warping inward toward the main frame 1 upon'a rise of temperature, will press the arm 9 and its pad or valve toward the hi ple and tend to sea] the leakort thereof. onversely, on a lowering o temperature,-said strips will warp or bend outward and leave the pendulous arm free to be swung outward by its weighted carrying block 10. 1 '1 Each saddle 12 is formed with a depending arm 15 and with a perforated ear or lug 16 above the horizontal plane of the saddle pivot,

' to which Iug is attached one end of a spring 17, the other end of which is attached 'to the 1 frame or base 1. The spring l'i'tends coustantly to draw inward the strip 13 or 14-. and to cause the lower arm 15 of the saddle to bear against an adjusting screw 18 threaded in a graduated dial-plate 19 carried b the arms 3, 4 and 5. Each screw 18 is provided with a pointer or indicator 2O movable over the graduations of its dial, the graduations indicating different degrees of tcn1pcr-, ature. Each saddle-is thus held normally in fixed position with its lower arm held against the adjusting screw 18 by its spring 17, but asthe screw 1s turned inward, the saddle will be rocked on its pivot and the thermostatic strip 13 or 14 will be swung outward or away from the pendulous arm 9, hence will require a greater riseof temperature to, cause it to press the pad 8 against nipple 6 and thus to seal the leak-port. Conversely, if the screw 18 be backed or turned to move outward, de-

pending arm 15 of the saddle will be caused to follow and bear against the receding end of the screw, the saddle will rock upon its pivot, and the strip will have its upper extremity brought inward the nipple 6, and a lesser fiexure will enable it to press the pad 8 into closing relation with the nipple and its leak-port. The spring 17 serves the further purpose of permitting the saddle to rock slightly outward in the event that the rise of temperaturebe so great as to cause a very marked inward bending of the strip carried by it, thus preventing the'stressing of said strip beyond its elastic limit, which of course would interfere with its proper functioning thereafter.

Projecting from the front or outer face of base-plate 1 is a tubular post 21 tapped to receive a screw-stem 22 carrying'a disk 23 and having a polygonal outer end to receive a key, wrench or other implement by which to turn it. The disk 23 bears, preferably at diametrically opposite points on its face, the letters HL and the letter H, or equivalent indicia, one or the other of which will be displayed-at a window or opening 240iv a shield or guard 25 overlying the front or a half rotation being permitted in practice,

and the pitch of the screw being made such that a half rotation in one or the other direction will give one or the other working ad justment of the stop. The screw stem 22 lies just outside the outer boundary of the strip entering 110105 in the sides 14, the disk 23 projecting into the path of movement of said strip and forming a stop to limit its approach to the base offrame 1 or to the pad-carrying arm or lid 9.

26 indicates a swinging frame the lower end of whichis carried on ivot-screws 27 of the base-plate or frame 1, and tapped to receive set screws. This frame carries a disk or saucer 28 rovided with stems or studs 29 to each of w 11011 is attached one end of a spring 30, the other end of which is attached to the base-plate or frame 1. Each of these springs is stressed or tensioned sufliciently to hold the upper or swinging end of the frame 26 normally against a stop 31 in the form of a nut carried by a threaded rod or stem 32 projecting outward from the face of the base-plate.

A second stop nut 33 is screwed upon-the rod or stem 32 on the outer side of the frame 26, so as to limit the outward swing or throw of said frame. By adjustment of the nuts the amplitude of the'swing may be determined.

The upper extremity of the frame 26 is formed with a seat or socket to receive a slidable pawl or dog 34 having a beveled upper end, and pressed upwardly or outwardly by a light spiral spring, as illustrated in'Figure'l.

Directly above and in plane with'the path of the pawl 34 as it is carried back and forth by the swinging frame 26, is a ratchetwheel 35, here represented as provided with twelve teeth of the common saw-tooth form,

the radial faces of which are opposedto the upright face of the pawl or dog 34. ratchet-wheel is made integral with or firmly joined or connected to a fiat disk 36, here shown of hexagonal form, hence presenting six fiat sides meeting in six obtuse angles. The ratchet-wheel 35 and disk 36 are mounted upon a common pivot-pin or axleextending between two brackets or studs projecting from the face of base 1. The radii of disk 36 extending through the points or angles are 'such that when one of said points or angles is brought to a horizontal line or perpendicular to, the frame or base 1 and to thermostatic strip 14, it will bear against the inner face thereof, thus pressing the strip a. short distance away from the pendnlous arm or carrier 9 and holding-it in such retracted position. At such time the spring 17 yields sufliciently to prevent any overstressing or permanent distortion of the compoundstrip. t

As there are twelve teeth in the ratchet, andas the disk 36 .has six points or angles and an equal number of intermediate flat faces, itwill be seen that successive movements of the wheel and disk, effected by the swing of frame 26 and pawl 34, will bring a1 ternately a point and a flat-face opposite the inner face of the strip 14. The radii of'the shown in Fig. 4; that This 1 leave a material space between such flat face and the strip 14 when such face is parallel with the strip, as in Fig. 1. The strip 14 is then free to act upon the in response to tem erature c 'anges.

To prevent the ackward movement of the ratchet-wheel 35 or overthrow in the direction of rotation,'there is provided a springsupported locking pawl or dog 37, conveniently attached to the frame or base 1 in the position shown inFig. 1.

Carried by the base-platel and facing the saucer or disk 28 of frame 26, is an expansion device or chamber 38, one or both walls of which is orare ada ted to be flexed or bulged outward when. a dilid'under pressure is introduced into said ing usual to provide one or both walls of said chamber with corrugations arranged in a generally concentric relation.

The relay B shown in Figs. 1 and 2 is a positive-acting relay, comprising a base 39 carrying an expansible element 40 of the same endulous arm 9 chamber, it befiat faces. of the disk, taken at their midlength, are enou h shorter than the radii extending througdl the points or angles to to which element is opposed a disk or saucer 41 of a swinging frame 42 fulcrumed at a point approximately midway between its ends, and carrying at its upper end a quickthrow valve device of the construction best is to say, the upper end of frame 42 is in the form of a box or shell 43, with'alined circular openings 44and 45 in its front and rear walls to permit it to swing over and clear of a head 46 of generally spherical form carried by the stem 47 of a three-way valve 48, which in its different positions seals and unseals a passage for air to the motor of a heat-control valve.

Eneircling thespherical head 46 is a contractile spring 49, conveniently made of a helical wire coil with its opposite ends' brought together and connected in any usual manner.' Owing to the fact that spring 49 is stressed or tensioned slightly before being passed about the spherical head 46, it will because of its tendency to contract, ride toward one or the other end of saidhead as soon as it is carried by the swinging of frame 42 past the medial or equatorial zone of head 46. As soonas the spring49 passes such medial zone and comes in contact withthe opposite wall of shell 43, it will act to move the valve stem and valvein a direction opposite to that in which the frame 42 is moving or has just moved. Consequently, when frame 42 swings inward to the position" indicated in Figs. 1 and 4, valve 48 will be caused to move quickly outward, and to seat itself against the inner endof the nipple 50 throu h which the valve stem 47 moves. Stem 47 ts loosely within said nipple, hence when the valve 48 is out of contact with the inner end of the nipple, the passage or opening through which the stem t7 plays affords a vent or leak-port for the valve chamber 51,- venting the same to the atmosphere. When the frame 42 swings outward, it first carries the annular spring-49"oi'1tward with it until the spring passes the medial zone of the spherical head 46, whereupon the spring actsto move thevalve-head, stem, and valve inward and to seat it upon mouth or port 52, thereby sealing said port and venting chamber 51 through the space around the'stem 47, as just-men-- tioned.

Between the upper portion of frame42 and the front or outer face of base 39 is interposed a spring 53 tending constantly to press the upper end of said frame outward, and to maintain it in such outward position when the leak-port 7 of nipple 6 is unsealed. When,

however, said nipple is sealed, pressure builds up in the chambcr of relay B, causing its front wall to expand and to press out the disk 41 of frame 42, thereby throwing the upper end of said frame inward toward the base of frame 39, such inward movement being limited by a stop 54 having a threadedstem 55 entering a tapped seat in a stud or projection 56 formed on the front of base 3.9.

As above explained, the inward movement of the upper end of frame 42 causes, through the action of the contractile spring 49, an outwardmovement of valve 48 and unsealing of the port 52, permitting air under pressure to pass by said port, chamber 51, passageway '57 and pipe 58 to the air chamber of a selfopening heat-control valve I, where the pressure of the air overcomes the opening tendency of the spring 59 of valve I and seats the valve, thus cutting off the heat in the wellknown manner.

The main air pipe G, which as stated communicates with air tank E and carries a pressure of 15 pounds ordinarily, communicates by branches 60 and 61, respectively, with the selector A and the relay B. In the case of the selector, pipe G communicates by a-passage 62 with the interior of expansible chamber 38, and serves when full pressure is afforded, to

press frame 26 outward to the position shown in Fig. 1 and to hold it insuchposition, the

its outward movement a tooth of ratchetwheel 35, and rotating said Wheel and consequently the disk 36, the space of one tooth or one-twelfth of arevolution. Upon lowering of the pressure in said chamber 38 and the collapse of its outer wall or diaphragm,

' frame 26 is drawn inward by contraction of thrown outward andrthe r springs 30 to a position where its pawl 34,

riding backward over the inclined face. ofa succeeding tooth, will engage the radial face thereof preparatory to. a. re-inflation of expansible chamber 38, when frame-26 will be atehet-wheel advanced another tooth. In this way cachinfiation of the expansion chamber causes a forward movement to the extent of one tooth, and each deflation permits a return movement of the actuating pawl34 for engagement with a succeeding tooth, hence a complete vibration or swing of the frame to engaging position and then outward, is essential to each step-by-step advance or rotation of the ratchet and disk.

By branch pi e 61 communication is had with the relay 1% the air passages and ports of which will be explained in connection with Figs. 1 and 4. Air is admitted simultaneously by port 52 to the valve chamber 51, and by port 63 to a filtering chamber 64: filled with wool or other dry filtering material, which takes out all dust or solid matters carried by the air current which might otherwise clog the leak-ports and other minute openings. Passing this filter chamber 'the air goes by passage 65 and connected passage 66, both shownin dotted lines in Fig. 1, to

the interior of expansible chamber 40, its

flow being regulated by a needle valve 67 capable of very accurate adjustment by turning its threaded body in a correspondingly threaded seat. The needle valve 67 reduces the flow of air to the expansible chamber 40 to a point below the venting capacity of leakport 7 of selector A, with which leak-port the valve communicates by a passage 68 and pipe 69, as shown in Fig. '1. The passage 68 connects with passage 66 Where the latter enters the chamber 40.

The action of the selector A and relay B, constructed and arranged as above described, is as follows: The strips 13 and 14 of the selector being arranged so that arise in tem perature will cause them to bend or warp inward, as above explained, they will engage and move pendulous arm .9 and carry the and such closure will be followed by inflation of expansible chamber Q-of the relay,

causing frame 42 to swing inward at its upper end, thereby causing an outward movement of the head 46 and stem 47 of valve 48,- unseating said valve from the mouth of inlet port 52 and seating it against the inner end of nipple 50, which latter is thus closed against escape of air from the valve cham-' ber 51. This adjustment of three-way valve 48 opens passage 57 and permits air to pass by pipe 58 to tl pneumatic motor 71 of main heat-control valve 1,- resulting in the closure I of said valve and the shutting ofi of heat from the'room or apartment in which the .se- 7 lector is located; The temperature in. said room or apartment consequently falls, causing the strip '13 to flex outward away from pendulous arm 9, and leaving control-thereof entirely to the other strip 14 which, as

explained, will seal the leak-port 7 and mainf 13o tain it sealed at a low temperature, and thus I shut off completely or partially the flow of the heating medium past heat-control valve I. This condition will continue so long as the parts are set or adjusted as above stated. If

instrument is located, the air pressure in the main air pipe'G is lowered so as to reduce the pressure therein from the normal pounds to, say, '8 pounds. Thereupon the front wall or diaphragm ofexpansible chamber 38 of the selector will collapse, and the swinging frame 26 will be drawn inward by the springs 30, thus carrying pawl 34 backward over a tooth of the ratchet-wheel 35 and causing said pawl to engage with the radial face thereof.

Prompt restoration of air pressure to normal causes inflation of said expansible chamber 38, thebulging front wall or diaphragm of whichbearing" against the disk 28 26 swings the latter and its of frame pawl 34 outward,

causing the ratchet-wheel to be rotated one tooth and the hexagonal disk 36 to be simi-.

larly turned a distance sulficient to bring one of its points or angles into contact with the 4 strip 14, forcing its free end out of contact with arm'9. The strip 13 having been bent or flexed outward away from the arm 9 by the lowered temperature, leaves said arm free to be lifted or swung from the nipple 6, and the valve orpad -8 to be withdrawnfrom the leak-port 7.by theweighted block or arm 10,th'u's unsealing the leak-port and permitting c'ollapseof expansible chamber 40 of the relay and consequentinward movement ofthe three-way'valve 48 and venting of motor 71 of main'air valve I, and the opening of saidvalve through the action of its unseating spring 59. Change of temperature in the room or apartment in which the selector is located will thus be placed under control of strip 13, and -;trip 14 though flexed or' warped toward the arm 9 by riseof temperature, is-held from engagement therewith by a point of the hexagonaldisk 36, so that when it is again put.

in control of arm 9 'byanother movement or step. advance of the ratchet-wheel 35, it ispress upon said arm, seal the.

in condition to leak port l 7, and bring about a lowering .of

temperature in the room or apartment.

tion of air pressure Toeflectthe quick lowerin and restorain pipe" and prevent waste of air'from tank E, there is provided the three way valve H having vent port 7 3. .This valve is provided" with two radial passages-in 90 degree relation, which nor' mally connect the tank E with pipe G, but

which when the valve is turned through 90 degrees in the'proper direction, shuts off communication'between said tank and pipe G and opens-communication between said pipe and restricted vent 73, thus permitting and causing a prompt restoration of the full 15 pounds pressure in pipe G and its branches.

The backward or inward movement of the pawl 34 to engage a fresh tooth of ratchet 35 is thus followed in a very brief time .by the outward movement of said pawl, with the resulting the rate et wheel and hexagonal disk. 4 In this way the settin ,of the selectorA may be quickly changer? by the attendant from a central point or station. This change will take place inall the roomsvin which are located selectors and relays of the above described construction and arrangement, and changes from high trol maybe alternated as frequently as desired, the total period required for change either way being very short. 4

For the purpose of enabling theattendant or person in charge of the heating plant to ascertain the. adjustment last made through manipulation of Valve H, an indicator C is provided. This pressed inward or into ratchet-engaging posi- I tion by a spring, and is moved outward pressure therein to the deadvance or turning [movement of to low temperature com at a window of'a guard or against the resistance of said spring through the. action of an 'expansible chamber, the outer wall of which .presses against the swinging frame to move it outward, the expansible chamber being in communication with the airpipe G.

' Obviously, details of construction-may be varied so long as they are kept within the range of known mechanical equivalents.

It is also to ratchet-wheel having twelve teeth, and a disk of hexagonal form or having six flat faces and six points or angles, are shown and described, the number maybe varied.

be understood that though a The temperature at which the strip 14 shall function to seal the leak-port 7 and cause a the heat to be shut oil will be determined by the setting of the screw 18 and indicator 20 controlling the initial adjustment of saddle l2 and its strip 14. Strip 13 is similarly adjusted.

Though I have here shown the selector and the relay as separate instruments, and ma so use them where desirable, they may an usually will be placed upon a common base or support, and if desired, under a single cover.

The disk 36 may take the form of a star wheel, or have a sinusoidal periphery, the alternate elevations and depressions serving the same purpose as the flat faces and angles of the hexagon or like geometric figure.

Similarl the stop 23 may be variedin form, rovide it be capable of adjustment to arrest strip 14 or to let said strip bend inwar far enoughto press the pad or valve 8 to its seat on the nipple 6, and thus toseal the leakport 7. p

Relays of the general character of that il'- 7 lustrated and above, described are in extensive use, and vary in details of construction according to the particular place in which they are to be used, and the special functions to be performed. That is to say, the leverage may be of the first, second or. third order, or the rela may be of the quick-acting or the gra ual-acting type, serving in the latter case to impart motion to an element of the temperature control system requiring inpositive movement. Mere reversal of parts of the devices here described for use in connection with self-closing heat-control valves, or with other devices reversely arranged as related to those here shown, may be made without departing from the spirit of this invention.

.Thus instead of arranging the'thermostatic strips 13 and 14 to move the pad or valve 8 in a direction to seal nipple 6 on rise of temperature, as illustrated, they may be arranged to vent said nipple on rise of'temperature in accordance with the showing-of Patent No. 1,099,923 granted to Gar-1F, J ohnson, June 16, 191i. The claims are to be read with this understanding. It is hence to be understood that the selector may be used wherever it is desirable to cause one or .another of two independent thermostatic elements to seal or unseal, or to impart motion to, a component of the temperature-control system, and that it is not necessarily used with a secondary valve of the particular type or havin the special function of valve 48.

It is o vious that by employing difi'erent substances for the strips 13 and 14 the invention may be applied to the like system of control in connection with changes in humidity of the atmosphere or other meteorological changes and conditions, and the claims are to be read with that understanding. In other words, the terms thermostatic strip or thermostatic bar are to be understood as the equivalent of or as comprehending a humidostatic strip, and similar devices, according to the particular application of the invention made. If the humidity of the air in the rooms or apartments is to be varied and controlled, the main valve, here represented as a heat-control valve, will control the delivery of moisture instead of heat, and the responsive element will be one responsive to hygrometric chan 'es, and similar adaptations will be made or the control of other V atmospheric conditions.

The adjustable stop 23 when moved outward prevents strip 14 from functioning, and leaves the temperature solely under control of strip 13, which will be set or adjusted for whatever temperature it is desired to maintain in the room or space controlled by the instrument A.

What is claimed is a 1. In a temperature control'system of the compressed air type the combination of a source of air under pressure; a self-opening heat control valve provided with a pneumatic motor for closing 1t; a secondary va ve serv ing' alternately to open communicationbetween the source of air under pressure and said pneumatic motor, and to close such communication and vent the motor; a relay for actuating said secondary valve, having a chamber in communication with the source of air under pressure and provided with a movable wall; a selector for controlling the functioning of said relay, said SGIGClAH comprising a chamber communicating with the source of air under pressure and having a movable wall and a leak-port for venting the relay "chamber; a pad or valve movable toward and from the leak-port to seal and unseal the same; two thermostatic strips, each held at one end and overlying at its free end the pad or valve,said strips adapted and arranged to bend or warp toward, and.to press said pad into sealing relation with the leak-port on rise of temperature in the surrounding medium; and means for puttingsaid pad under control of either one of'said strips at will.

2. In a tem compressed air type, the combination of a source of air under pressure; a self-opening heat control valve provided with a pneumatic motor for closing 1t; a mcondary valve serving alternately to open communication between the source of air underpressure and said pneumatic motor, and to close such communication and vent the motor; a relay for actuating said secondary valve, having a chamber in communication with the source of air under pressure and provided with a movable wall; a selector for controlling the functioning of said relay, said selector comprising achamber communicating with the source of air under pressure and having a movable rature control system of the 'wall and a leak-port ing alternately ,fior venting ,the relay chamber; a pad-or valve movable toward and from the leak-port to "seal and unseal the same; two thermostatic strips, each held at pne end and overlying at its free end the pad or valve, said said padinto sealing relation with the leak port on rise of temperature in the surroundmg medium; means for setting the respective strips to 'act upon the pad atrelatively different temperatures; andmeans for putting said pad under control of either one of said strips at will. i v 3 n 3. In a temperature control system of the compressed air type, the combination of a source of air under pressure; a selfopening heat control valve provided with a pneumatic motor for closing it; a secondary valve servto open communication between the source of air under pressure and said pneumatic motor, and to close such communication and vent the motor; a relay for actuating said secondary chamber in communication with the source of air under pressure and provided with a movable wall; a selector for controlling the functioning of said relay,

valve, having a ing a chamber communicating with h the actuating the source of air under pressure and having a movable walliand a leak-port for venting the relay chamber; a pad or valve movable toward and from the leak-portt'o seal and unseal the same; two thermostatic strips, each held at one end and overlying at its free end the pad or valve, said strips adapted and arranged to bend or warp toward and to press said pad into sealing relation with the leak-port on rise of temperature in the surrounding medium; means for setting the respective strips to act-upon the pad at relatively different temperatures; and a stop movable into position to arrest inward movement of one of the strips and prevent 'it from pad and sealingthe leak-port, thereby placing said pad under control of the other strip alone.

4'. A temperature control apparatus otthe comprising a source of compressed air type,

heat-control valve proair under pressure; a vided with at i I for moving the heatcontrol valve in one direction, and autoinatic means for moving it in the reverse direction when the pneumatic motor is vented; a secondary valve between the source of air under pressure and the pneumatic motor of the heat-control valve, serving alternately ,to establish and to cut off communication between the motor and the air'source and to vent said motor;'a second pneumatic. motor --for actuating'the' secondary valve provided with a leak-port; a pad or valve or sealing said leak-port; two thermostatic stri s, each adapted to warp or bend-andmove t e p ed strips adapted and are ranged to bend or warp toward, and to press ing said pad or said selector 'compr1s.

' it from pneumatic motor in 'communication wlth said source,

-tively -hi h j and papa 1e or valve into sealing relation with the leak- -port on rise of temperature; means for setting said strips to act upon said valve at relatively differenttemperatures; and a stop movable into position to limit the movement of one of said strips and prevent it from seatvalve; thus placing the pad or valve solely under control of the other strip. I

5. In a temperature control system of the compressed air type, a source of air under pressure and a plpe or conduit for the air; a relay of the character described, communipneumatic motor for actuating the relay; a selector, comprising a base having a leakport communicating with and serving to vent said relay motor; a pad or valve for eating with said source and containing a sealing said leak-port; two thermostatic strips each held at one end and having its opposite end overlying the pad or valve and serving to move the same'to sealing position,

upon rise of temperature and consequent.-

bending of the strip; means for adjusting said strips to act upon the pad or. valve at relatively diflerenttemperatures; a stop disk having alternate sections of lower and higher elevation, movable to bring either a higher or lower portion into the path of one of said strips; a ratchet: Wheel connected with and serving to impart rotation to said disk; a pawl for engaging one after'another the teeth, of the ratchet wheel to impart a step-by-step rotation thereto and to the dish; a movable frame carrying said pawl; a spring for moving said frame in one'direc- 131011; an expansible chamber for-moving said .frame inthe opposite direction when said chamber is inflated; and means for alternately causing anabnormal pressure in the air pipe and restoring the normal. pressure therein; whereby theirame and pawl are moved back and forth. to rotate the ratchet wheel and disk, the higher portionsof the disk serving when brought into the path of the strip, t o limit its movement and prevent acting upon the leak-port pad or valve, and the lower port-ions of the disk, whenbrought .into' the path ofthe strip, serving to permit said strip to act upon and to seal said pad or valve. v Q

6. In a temperature control system of the compressed air type, havinga compressed air pipe or main and aleak-port in the air pipe or system tobe' sealed .upo'n rise of temperature to a predetermined point; a valve or pad for sea ing said port; two independent thermostatic strips-each adapted to warp or bend in. a direction to move said valve or pad into sealing os'ition on rise oftemperature,csaid stripssaid' pad or'valveat relatively difl'erent tem-- per-aturesya.stop-having portions of relaeing adjusted toact upon and Y relatively low projection, of movement to "bring a sectiona cumulate or to wmovable element of the system; a pad or cumulate or pin the pad of either character into the path of one of said strips; a'pneumatic motor 'for moving said stop to position alternately a high anda low ortion in the path of said strip and there y to restrict its movement in sealing direction or leave it unrestricted, as desired; and means for momentarily venting the air pipe and the stop-adjusting motor, to lower the pressure therein and deflate the motor, and thereafter restoring normal pressure andinflating the motor to effect adjustment of the stop.

7 In a temperature control compressed air type, the closing of which permits pressure to acbuild up in and impart motion to a movable element of the system; a pad or valve for sealing said leak-port; two thermostatic strips each held atone end and overlappingthe pad or valve at the opposite end, said stripsarranged to move toward said pad or valve on rise of temperature and adjusted to so act upon the pad or valve at relatively different temperatures; a stop in the path of system vof the inward movement of one of said strips and adjustable relatively to said'strip to permit full pad-closing movement thereof, or to limit the movement of said strip and prevent,

its action to press thepad or valve into seals ing relation to the lea -port, a source of air under pressure; an air main extending from said source to said leak-port; a vent in the air main intermediate the source of air under pressure and said leak-port; and a valve in he .air main serving to close communication between said main and the source of compressed air, and to open said vent to the atmosphere and lower the pressure in the main beyond said valve.

8. In a temperature control system of the compressed air type, employing a leak-port the closing of which permits pressure to accumulate or buildup in and impart motion to a movable element of the system; a pad or valve for sealin said leak-port; two thermostatic strips eac held at one end and overlapor valveat the opposite end, said strips arranged to move toward said pad or valveon rise of temperature and adjusted to so act upon the pad 01 valve at relativel different temperatures; a stop in the pat of inward movement of one of said strips and adjustable relatively to said strip to permit full pad-closing movement thereof, .or to limit the movement of said strip and prevent its action to press the ad or valve into sealing relation to the lea -port; and means for adjusting said stop from. a distant point.

9, In a temperature control system of the ompressed the closing of which permits pressure to acbuild up .in and impart-motion valve for sealing said leak-port; two thermostatic strips each held at one end and over -diflere'nt temperatures; a stop in the employing a leak-port or non-arresting ing air type, employing a leak-port,

mess \4 g laprping the pad or valve'at the opposite end, sea or valve on rise of temperature and adjusted to so act upon the pad or valve at relatively path of inward movement of one of said strips and adjustable relatively to said strip to permit full pad-closing movement thereof,- or to limit the movement of said strip and prevent its action to press the pad or valve into sealing relation to the leak-port; and means operable by producmg alternately an abnormal strips arrangedto move toward said pad and a normal pressure n the air pipe or main,

for so adjustingsaid stop.

10. In a temperature-control system of the compressed air type, employing a leak-port the closing of which permits to a movable element oflthe system; a pad or valve for sealing said leak-port; two thermostatic strips each held at one end and overlapping the pad or valve at the opposite end,

so 7 I ressure to accumulate or build up in and impart mot1on.

said strips arranged to move toward said pad I or valve on a rise of temperature and adjusted to so act upon the pad or valve at relatively different temperatures; a stop in the-path of inward movement of one of said strips and adjustable relatively to said strip to permit full pad-closin g movement thereof, or to limit the movement of said strip and prevent its action to press the pad or valve into sealing relation to the leak-port; means operable by producing alternately an abnorma and a normal pressure in the air pipe or main, for so adjusting said stop; ally adjustable in the path of movement of the selected strip to prevent or permit, as desired, the automatic control of the first-mentioned stop. 7

-11. In a temperature control system of the compressed air type, a selector of the character described, comprising two independent thermostatic strips anda valve or pad closable thereby toseal or vent aleak-port in the air system; a stop adjustable into arresting for positioning said stop strips; mechanism and restoration through alternate lowerin to normal of the pressure inthe air pipe of v the system; and a valve in said air pipe servalternately to out ,ofi' the supply of air to said pipe and to vent the pipe, and to close the vent and reconnect the air pipe with the source of supply. 7 a

12. In a temperature control system of the compressed air type, of compressed air, an airconduit and a leakport' therefor ing independently to seal said leak-port at one or another temperature; a stop'adjust-. able in the path of said stri s, to limit the inward movement of sai strip and prevent its closing of the leak-port, or to ermit such closing, as required; a vent in a air main between and a second stop manuposition of one of saidcomprising a source two thermostatic strips servof closingmovement'of one;

the source of compressed air and the leakcontrollable from a remote point, for putport; and a valve in the air main serving ting one of said members [into and out of to close communication between said main action at will. c v --and the source of compressed air, and to 17. In a heatin system, the combination open said vent to the atmosphere and lower of a valve contro linga heating conduit, a the pressure in the main beyond said valve. fluidpressure motor connected to operate 70 13. In a temperature control system of said valve, a second valve controlling the the compressed air type,-employing two inflow of fluid pressure to said motor, a therdependently-acting thermostatic strips, 9., mostatic element controlling the action of m stop comprising a threaded stem entering a said second valve, a pressure responsive de- 75 threaded socket and carryin a disk bearvice actuated by fluid pressure, and coning suitable symbols; and a s ield or guard nections between said device and said ther in front of said disk and having a window mostatic element, said connections including or opening through which one or another means for inoperatively positioning said v symbol may be dlsplayed as said disk and thermostatic element with respect to said 80 stem are rotated, said stem having its outer second valve upon periodical actuations of end arranged in the path of one of the thersaid pressure responsive device. mostatic strips and adapted, as one or the 18. In a device of the character described, other ofits symbols is displayed through the'combination of a valve, a thermostatic the opening in the ard, to limit the inward element for controlling said valve, a pressure 85 warping o one 0 said stri s or to permit responsive device actuated by fluid pressure, .full movement thereof, as esired. and connections between said thermostatic 14L In a temperature control system of element and said pressure responsive device, the compressed air type, comprising a source said connections including means operated of compressed air, an air main and a nipby the actuations of said pressure responsive le having a leak-port; a pad or valve devicefo-r periodically rendering said theror sealing said leak-port; two independmostatic element inoperative'with respect to ent members responsive to meteorological said valve. changes, and each movable toward the pad a 19. In a device of the character described, or valve to cause it to seal the leak-port, the combination ofavalve,athermostatic eleeach member capable of initial adjustment ment for controlling the action of said valve, to act upon said pad of valve at difierent a pressure responsive device, acam adapted stages or degrees of change in given atmosto periodically engage said thermostatic elepheric COIldltlOIlS; means for holding one ment whereby the latter is actuated into and of-said members out of art-sealing action; out of operative relation with res ectwto said 100 a vent in the air main etween the source valve, and means actuated by sald pressure of compressed air'and the leak-port; and a responsive'device for'operating said cam. valve inthe air main serving to close com- 20. In a heating system, the combination of munication between said main and the a valve controlling a heating conduit, a fluid 40 source of compressed ,air, and to open said pressure motor connected to operate said ventto the atmos here and lower the presvalve,a second valve controlling the flow of sure in the main eyond' said valve. v fluid-pressureto said motor, a thermostatic 15. In combination with a control syselement controlling the action of said second tem of the compressed-air type, comprising valve, a pressure responsive device actuated automatic means for-closing and open ng a b fl id pressure, and manually operated 11o m p y Valve p f, means for permanently locking said thermo- Pendent members responslve to a staticelement against the action of said prespheric changes of like character, and each sure responsive device I, capable of lndependent initial ad ustment, 2L In a control System, the combination sald members.be mg m to and a i with means for regulating a supply of heat, to actuate .sald i f closmg ofa controller for said regulating means ini at dlfierent e m 9 sea cludin thermostatically actuated high tem-- v oyed; and pneumatic means controllable t a d 1 t t 6 cont 011.11

rom a remote point, for utting one of said F 0w empem r 1 g members into and out of action at will. mstrumentahtles; Pneumatlc mefms 16. In combination with a control system ferable from {emote P for P g Sald of the compres5ed -air type, i in autoinstrumentahtles operative selectively to conmatic means for closing and opening a main trol Sald regulatlng m h t sup 1 valve or damPer t i d d-- 22. In a control system, the combination Bo entmem, ers each responsive to temperature Wlth means for regulating a supply- Of hea 125 changes, and each ca able of independent of acontroller for said regulatm means 1ninitial adjustment, sai members being com- 'cludmg thermostatically actuated high temmon, to and serving to actuate said valve perature and low temperature controlling 1nopening and'closing means at relatively difstrumentahties; pneumatic means operable 65 'zferent temperatures; and pneumatic means from a remote point for rendering said instrumentalities operative selectively to control said regulating means; and manually operable means adjacent said controller forrendering one of said instrumentalities oper- 5 ative regardless of the action of said pneumaticmeans; Y

23. In a control system of the compressed air type, the combination of means for regulating a supply of heat; a thermostatic con troller-for said means including a chamber, means for supplying air thereto at a restricted rate and two thermally responsive elements each arranged to control the venting of said chamber and each functioning at a different temperature from the other; and pneumatic means controllable at will from a remote point for causing said elements to function selectively in alternation with one another. I a

24. In a control system of the compressed air type, the combination of means for regu- .lating a supply of heat; a thermostatic controller for said means including a chamber,

means for supplying air thereto at a re stricted rate and two thermally responsive elements each arranged to control the vent- 'ing of said chamber and each functioning at a differenttemperature from the other; and pneumatic means controllable at will from a remote point for rendering one of said elements inoperative to control such venting while ermittin'g the other to function.

25. n a control system of the compressed air t pe, the eombinationof means for regula g a supply of heat; a thermostatic controller for said means including a chamber, 1 means for supplyin ed rate and two thermally responsive elements each arranged to control the venting 40 of said-chamber and each functioning at a difi'erent temperature from the other; pneumatic means controllable at will from a remote point for causing said elements to function selectively in alternation with one an-- other; and manually set means for causing one of said thermally responsive elements to control while said pneumatic means is con- 1 lit'ioned' tocause the other element to conro 26. In cheating system, the combination j of heat controlling means; a fluid pressure motorconnect'ed to operatelsaid means; a. 1 thermostatic: element arranged to control said" fluid pressure 'motor; a pressure fluid supply line for supplying motive fluid to said motors-under, the'control of said thermostatic'element; and means'responsive to g the; -'of fluid'ipressuresupply' and operative b sur s of abnormal supply pres sure toshi sai thermostatic elementalternately between two positions.

27. In a heating system, the combination of heat controlling means; a fluid. pressure 35 motor connected tooperate said-means; a

air thereto at a. restrictthermostatic element arranged to control said fluid pressure motor; a pressure fluid supply line for supplying motive fluid to said motor under the control of said thermostatic element; means responsive to the pressure of' fluid pressure supply and operative by surges of abnormal supply pressure to shift said thermostatic element alterna-tel between two positons; and manually opera le means for holding said thermostatic element in one of said positions.

28. The combination of a thermostatic device; means for adjustin the same between two settings to maintain either of two different temperatures; and a pressure responsive device connected with said adjusting means and operable-by successive pressure surges to adjust said thermostatic device alternately between said two settings.

29. In a heatin system, the combination of means for regu ating a supply of heat; a fluid pressure motor connected to operate said means; a valve controlling the operation of said fluid pressure motor; a thermostatic device adjustable to respond at either of two temperatures and controlling said valve; a pressure fluid supply line for supplying motive fluid to said motor under the'control of said valve; a member movable to assume alternately two functionally different positions,-in one of which it causes the thermostatic device to respond at one temperature and in another of which it causes the thermostatic device to respond'at a'difl'erent temperature; and a pressure'responsivedevice subject to pressure in said supply line and operable by changes of pressure therein to' move said movable membe r. v 30. In a heatin system, the combination of means for regu atmg'the supply of heat; a fluid pressure motor connected to operate said means; a valve controlling said motor; a thermostatic device controlling said valve, said device being adjustable to respond at two characteristically diflernt tempera- I tures; a member operatively connected with said thermostatic device and movableto assume alternately two functionally different positions, in one of whichit adjusts said thermostatic device to respond at one temperature and in the other of which it adjusts said thermostatic device to respond at the other temperature; a pressure responsive device operatively connected to said member to move the same between said two positions .upon variationsof pressure therein; and

means for varying said pressure. 7 I

31. 'In a control. system, the combination of heat controlling means; a fluid pressure motor connected to actuate said means; a

- controller for regulating the pressure in said I motor and including thermostatically actuated hl h temperature and low temperature controlling instrumentalities; means for sup- 1'30 plying motive pressure fluid; means for varying the pressure of said fluid; and means. responsive to such variations for rendering said instrumentalities tiperative selectively. In testimony whereo I have signed my name to this specification.

CHARLES L. FORTIER. 

